8393ac6895
* Introduces Schedule_context * Use fast-interrupts or normal interrupts * Add mode-transition between secure/non-secure world * Limit system resources for Genode apps due to non-secure world This commit implements the newly introduced Vm session interface to be used on top of TrustZone capable Armv7 CPUs. Therefore a new Schedule_context is introduced in the kernel. Threads and Vms are both Schedule_contexts used by the scheduler. In contrast to a thread a vm uses a different assembler mode switch to the non-secure, virtual world, as well as another exception is used, when the non-secure world is left. For both worlds to co-exist the interrupt-controller needs to be configured, so that the secure (Genode) world uses fast-interrupts only, and the non-secure world only legacy interrupts. The only TrustZone capable platform the base-hw kernel works on top of is the CoreTile Express 9x4 for the Versatile Express motherboard. For a virtual machine working properly on top some platform resources must be reserved. Therefore there exist two flavours of this platform now, one with the 'trustzone' spec-variable enabled, and one without. If 'trustzone' is specified most platform resources (DDR-RAM, and most IRQs) are reserved for the Vm and not available to the secure Genode world.
24 lines
571 B
C++
24 lines
571 B
C++
/*
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* \brief Kernel function implementations specific for Cortex A9 CPUs
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* \author Stefan Kalkowski
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* \date 2012-10-11
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*/
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/*
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* Copyright (C) 2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <kernel_support.h>
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Cpu::User_context::User_context()
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{
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/* Execute in usermode with IRQ's enabled and FIQ's and
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* asynchronous aborts disabled */
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cpsr = Cpsr::M::bits(Cpsr::M::USER) | Cpsr::F::bits(1) |
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Cpsr::I::bits(0) | Cpsr::A::bits(1);
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}
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